Apparatus for burning pulverized fuel



Aug. 23, 1938. H. c. CARTER APPARATUS FOR BURNING PULVERIZED FUEL Filed Dec. 18, 1934 kE/VTUR i-L LARTEE fis tail . Patented Aug 2 Haskell 0. Carter, Portland, Oregn, minor to Iron Fireman Manufacturing Company, Portland, Oreg.

Application December 18. 1934, Serial No. 758,051 1 claim. (Cl. 110-28) This invention relates generally to heat generof the shell 23 is connected a return bend 24 ating devices, and particularly to an apparatus for which is joined by a vertical pipe 25 to a second burning pulverized fuel. return bend 20 which is connected by a riser pipe The main object of this invention is the provi- 26-A to the top 21 of the furnace. The pipe being liberated to the atmosphere. therefrom, an example of which is shown in The second object is the construction of a United States Patent Number 1,941,449. special form of furnace for use in the practice The solids from this-fan are discharged through 10 of the invention. a pipe II into a hopper 32 from which they are n other j s. Will become more removed in any convenient manner, such as by apparent from the specification following as 11- withdrawing same into an ash box II disposed lustrated in th a pa g drawin in whi h: beneath the hopper 32. A suitable motor 34 is Fig. 1 is a plan of the device. provided to drive the exhaust fan l0. 16 Fig. 2 is an elevation with a portion of the The furnace ll is provided with a clean-out furnace broken away in section. opening 35 which communicates with the interior Fi 3 is a t on taken 810118 the i H of the shell 23 and is closed by means of a door Fl g The usual water connections 31 and 38 are Similar numbers of reference refer to simila t d, although they form no part; th 20 Pa ts thro h h VieWspresent invention; same being equally applicable Before entering into a description of this int warm air furnaces, vention it will be understood that devices for I rder to supply powdered fuel to the pipe I! b rni p w er f l h I s" n in 1188- Il; there is provided a crusher I! which is operated is therefore not my intention to cover such devices by motor 40, or may be operated'from the same 2 adly. my mp v m t r lat n en ally to prime mover as is the fan I0 without departing the combination of a burner for powdered fuel from the spirit of'tms invention F is with an exhaust fan which serves as 8 sepamwr livered to the crusher 38 from the hopper I by for moving the solids from the gases. gravity.

must also be lllldftl'StOOd all flppala- The operation of the device is as follows: As-

is of the fuel travels at 8 '81- the motors and are operatively high and therefore its path ated, it follows that the fan 30 will reduce the travel must be extended far beyond the distance pressure within the me box a causing the to available in the ordinary type of furnace, in order now through the pipe I mm the fire box drawing to provide ample time for the combustion to take h it pawdered fuel which is hem-g delivered by Bo place and the heat contained in the fuel to be the crusher at The correct proportion between given up to the conveying medium.

Referring m detail to the drawing, there is the amount of fuel and air delivered is obtained by regulating the damper ii. The particles 01 shown a furnace III which, in this instance, is of V 40 the "hot water type and is covered by means of an duel which float into the are box 23 are Ignited by insulating Jacket H. In the bottom I2 is formed a cylindrical well it in which is formed the reheme they have fli the entire length the conduits 24 to 2 tort H of refractory material.

The retort H is preferably in the form of a Obviously the number of pipes cone through whose central opening I! extends can be increased for the purpose of further 45 the pipe l6 which supplies fuel and air to the noz gating the distance traveled by the gases zle The gas pipe a is provided t0 supply gas escaping from the furnace, without departing to the pilot burner, l8-A which extends into from the M tmsmventlonr the retort H. A damper I 8 is placed within the It can seen from the foregoing that there 18 opening I 5 around the pipe I and is controlled Provideda system burning Powdered fuel Whlfih 50 by the manually operated rod 20. Air enters the will o ome t conditions usually a mpa yo enin is through the tunnel 2| from t pering such installations, and, moreover, due to the forated floor plate 22. velocity of the gases passing through the furnace, Over the well I 3 is secured a conical shell 23 there will be set up a scouring action which will which constitutes the the box. To the upper end keep theinterior of the gas conducting conduits 55 clean and enable them to transm t the liberated I claim: heat to the water or other medium which sur- In an apparatus for burning powdered fuel, rounds the elements 28 to lt-A. the combination of a firebox having an elongated In an apparatus oi this type a chimney will be combustion chamber associated therewith, an

almost unnecessary since no stack draft is reexhaust fan for drawing the products oi combus- 5 quired as the gases discharged irom the ian outlet tion from the combustion chamber whereby the l! are practical! tree from all solids sincethese pressure within the combustion chamber may be have been t pp o t in t pp "an reduced below that oi the surrounding atmosthe combustion within the M box ll has been phere and a powdered iuel ieeder open to the at- 10 8 c mpl t mt ther 11 Prac cally no smoke mosphere on one side and discharging into said 10 assing from the iurnao firebox on the opposite side whereby powdered It is desirable to provide a control valve 43 in fuel may be drawn into said firebox by the same the pipe I! in order that the state oi combustion tan which removes the products of combustion and the ratio between the air and fuel delivered therefrom.

15 may be better controlled. EABKEU-I c. csnm. ll 

